var nav, nav1, nav2, lis;
window.onload = function() {
	nav = document.querySelector('#show_nav');
	nav1 = document.querySelector('#show_nav1');
	//nav2 = document.querySelectorAll('.show_nav2');
	h3s = nav1.querySelectorAll('.h3');

	nav.onmouseover = function() {
		nav1.style.display = 'block';
	}

	nav.onmouseout = function() {
		nav1.style.display = 'none';
	}
	for(var i = 0; i < h3s.length; i++) {
		h3s[i].index = i;//报错,给每个h3都加个标题
		h3s[i].onmouseover = function() {
			//nav2[this.index].style.display = 'block';
			//nav2[this.index].style.left = '200px';
			if(h3s[this.index].querySelector('.show_nav2') != null){//没条件判断则JS代码报错.
				h3s[this.index].querySelector('.show_nav2').style.display = 'block';
				h3s[this.index].querySelector('.show_nav2').style.left = '200px';
			}
			
			
//			this.style.backgroundColor = 'rgba(255,0,0,0.3)';//鼠标移上去时背景色
		}
		h3s[i].onmouseout = function() {
			//nav2[this.index].style.display = 'none';
			if(h3s[this.index].querySelector('.show_nav2') != null){
				h3s[this.index].querySelector('.show_nav2').style.display = 'none';
			}
//			this.style.backgroundColor = '#ccc';//鼠标移开始背景色
		}
	}
}


// 加入收藏 < a onclick="AddFavorite(window.location,document.title)" >加入收藏< /a>

function AddFavorite(sURL, sTitle)
{
	
    try
    {
        window.external.addFavorite(sURL, sTitle);
    }
    catch (e)
    {
        try
        {
            window.sidebar.addPanel(sTitle, sURL, "");
        }
        catch (e)
        {
            alert("加入收藏失败，请使用Ctrl+D进行添加");
        }
    }
}
//设为首页 < a onclick="SetHome(this,window.location)" > 设为首页 < /a>
function SetHome(obj,vrl){
        try{
                obj.style.behavior='url(#default#homepage)';obj.setHomePage(vrl);
        }
        catch(e){
                if(window.netscape) {
                        try {
                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
                        }
                        catch (e) {
                                alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。");
                        }
                        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
                        prefs.setCharPref('browser.startup.homepage',vrl);
                 }
        }
}

//使用
//< a  href="#" onclick="SetHome(this,window.location)" > 设为首页 < /a>
//< a  href="#" onclick="AddFavorite(window.location,document.title)"> 收藏本站 < /a>